As one of its daily deals, PricePlunge offers the ThermaPAK HeatShift CoolGuard 17" Notebook Sleeve, model no. HSN17A, for $12.99 plus $4.99 for shipping. That's the lowest total price we could find by $33. This neoprene sleeve purports to cool your laptop by at least 10 degrees Fahrenheit. Deal ends August 2.